Abstract

Pr3+-doped medium-low phonon energy heavy metal germanium tellurite (NZPGT) glasses have been fabricated and the intense multi-peak red fluorescence emissions of Pr3+ are exhibited. Judd-Ofelt parameters Ω2 = 3.14 × 10−20cm2, Ω4 = 10.67 × 10−20cm2 and Ω6 = 3.95 × 10−20cm2 indicate a high asymmetrical and covalent environment in the optical glasses. The spontaneous emission probabilities Aij corresponding to the 1D2→3H4, 3P0→3H6, and 3P0→3F2 transitions are derived to be 1859.6, 6270.1 and 17276.3s−1, respectively, and the relevant stimulated emission cross-sections σem are 5.20 × 10−21, 14.14 × 10−21 and 126.77 × 10−21cm2, confirming that the effectiveness of the red luminescence in Pr3+-doped NZPGT glasses. Under the commercial blue LED excitation, the radiant flux and the quantum yield for the red fluorescence of Pr3+ are solved to be 219μW and 11.80%, respectively. 85.24% photons of the fluorescence in the visible region are demonstrated to be located in 600−720nm wavelength range, which matches the excitation band of the most photosensitizers (PS), holding great promise for photodynamic therapy (PDT) treatment and clinical trials.

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